12y=21+9y

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Solution for 12y=21+9y equation: 



12y=21+9y

We move all terms to the left:

12y-(21+9y)=0

We add all the numbers together, and all the variables

12y-(9y+21)=0

We get rid of parentheses

12y-9y-21=0

We add all the numbers together, and all the variables

3y-21=0

We move all terms containing y to the left, all other terms to the right

3y=21

y=21/3

y=7

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